Fertilizing device

The utility model discloses a fertilizing device which comprises a main pipeline I, a main pipeline II, a pressure pump and a fertilizing box, a water outlet of the pressure pump is communicated with one end of a main pipeline III, the other end of the main pipeline III is communicated with an inner cavity of the main pipeline II, and a plurality of water flow treatment devices are arranged between the main pipeline II and the main pipeline I in a communicated mode. An inner cavity of the third main pipeline is communicated with an inner cavity of the second main pipeline through a Venturi tube, a water suction port of the Venturi tube is communicated with an inner cavity of the fertilization box through a conveying tube, and control valves are mounted on the Venturi tube and the part, between the Venturi tube and the first main pipeline, of the third main pipeline; the fertilizing device activates common irrigation water into micromolecular active water, dissolves fertilizer, becomes nutrient solution and un